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March 29, 2015

March 29, 2015

Posted by **Christina** on Tuesday, December 7, 2010 at 8:36am.

7r-3s=14

3r+7s=64

Could never figure out the elimination method. Would love some help with this one. Thanks

- Algebra -
**drwls**, Tuesday, December 7, 2010 at 9:44am21r - 9s = 42

(I multiplied the first eq. by 3)

21r + 49s = 448

(I multiplied the second equation by 7)

58s = 406

(I subtracted the third equation from the fourth, to eliminate r.)

The remaining steps are easy.

s = 7

7r -21 = 14

r = 5

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